Quarl burner

ABSTRACT

A flame-injection throat for a boiler is lined by shaped refractory tiles adjacent edges of which are complementarily rabbetted to interfit. Some of the tiles have in their front faces recesses from which extend rearwardly through the rear faces of the tiles through-openings for the passage of the shanks of bolts fast with tubes disposed in banks at each of two opposed sides of the throat. The tubes are out of contact with one another and the tube axes are normal or substantially normal to the throat axis. The tube lengths flanking the tiles at said opposed sides of the throat are fully embedded in refractory cement which anchors the tiles in place. Locking nuts are secured in the bolt shanks in said recesses and the latter are flush filled with refractory cement.

Black [451 Feb. 26, 1974 1 QUARL BURNER William Brown Black, Renwold, Kilbarchan Rd., Bridge of Weir, Renfrewshire, Scotland June 30, 1972 [76] Inventor:

[22] Filed:

[21] Appl. No.: 268,149

[52] U.S. Cl 122/235 B, 29/157.4, 29/5272, 122/6.5 [51] Int. Cl. F22b 37/20 [58] Field of Search 122/235 R, 235 B, 6.5, 6.6; 29/157.4, 527.2; 264/30 [56] References Cited UNITED STATES PATENTS 1,936,161 11/1933 Hedrich 122/235 B 1 2,215,079 9/1940 Hess 122/6.5

3,007,458 11/1961 Leon et a1. 122/235 B 3,204,610 9/1965 Voorheis et a1... 122/235 B 3,233,597 2/1965 Svendsen 122/235 B 3,486,533 12/1969 Doherty et a1 264/30 Primary ExaminerWi1liam F. ODea Assistant Examiner-Peter D. Ferguson Attorney, Agent, or Firm-Young & Thompson [5 7] ABSTRACT A flame-injection throat for a boiler is lined by shaped refractory tiles adjacent edges of which are complementarily rabbetted to interfit. Some of the tiles have in their front faces recesses from which extend rearwardly through the rear faces of the tiles throughopenings for the.passage of the shanks of bolts fast with tubes disposed in banks at each of two opposed sides of the throat. The tubes are out of contact with one another and the tube axes are normal or substantially normal to the throat axis. The tube lengths flanking ,the tiles at said opposed sides of the throat are fully embedded in refractory cement which anchors the tiles in place. Locking nuts are secured in the bolt shanks in said recesses and the latter are flush filled with refractory cement.

4 Claims, 4 Drawing Figures P T NT H82 6 1914 SHEET 1 OF 2 QUARL BURNER This invention relates to flame-injection throats in or for boilers, and to methods of forming same.

According to the present invention a flame-injection throat for a boiler is lined by shaped refractory tiles at least some of which have in their front faces recesses from which extend rearwardly through-openings for passage of the shanks of bolts fast with tubes disposed in banks at each of two opposed sides of the throat, the tubes being out of contact with one another and being normal or substantially normal to the throat axis, refractory cement fully embedding the tube lengths flanking the tiles at said opposed sides of the throat and anchoring the tiles in place, locking nuts secured on the bolt shanks in said recesses, and refractory cement flush filling said recesses.

Also, according to the present invention, a method of forming a flame-injection throat of a boiler, comprising applying to a duct wherein the throat is to be located a backing of refractory cement, applying against the backing at each of two opposed regions of the duct intermediate lengths of circulation tubes disposed in a bank in non-contiguous relationship with their axes in planes normal or substantially normal to the duct axis, at least some of said tubes having bolts welded thereto and extending towards the duct interior, applying further refractory cement to completely embed said intermediate lengths, applying against said further refractory cement tiles of refractory material shaped to fit together to define opposed regions of the throat, appropriate tiles having through openings for passage of said bolts and ending in recesses in the tile faces for location of bolt-engaging locking nuts, filling said recesses with refractory cement flush with the tile faces, and fitting shaped tiles of refractory cement to complete the throat.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a horizontal cross-section through a flameinjection throat for a boiler;

FIG. 2 is a vertical section on the line A-A of FIG. 1; and

H68. 3 and 4 are views on a larger scale, showing, respectively, a joint between adjacent tile edges and the relationship of a bolt with a tile.

Referring now to the drawings, the flame-injection throat is lined by shaped refractory tiles 5 which are 2 inches thick save at the upper side of the throat where there is an increase in thickness to 3 inches. The throat is cylindrical and includes a median length whereat the diameter between the front faces 6 of the tiles is 40 inches and from which the throat diverges in both directions. The arcuate lengths of the tiles are constant at both sides of the throat but differ at the upper and lower parts of the throat. However, there is similarity in construction at adjacent tile edges throughout the throat periphery, and, as can be seen particularly in FIG. 3, adjacent tile edges are complementarily rabbetted to interfit, the resultant tongues 7 projecting /2 inch and a space 8 of A; inch being left at the rabbetted faces when the tiles are fitted together.

Some of the tiles 5 have recesses 9 formed in their front faces 6, as particularly shown in FIG. 4, throughopenings 10 extending from the centres of the bottoms of the recesses 9 to the rear faces 11 of the tiles. The

openings 10 are oblong transversely being 1 inch long and A inch wide, the recesses 9 being parallel-sided and of 1% inches diameter.

Banks of tubes 12 are disposed at each side of the throat, the tubes being out of contact with one another and being normal or substantially normal to the throat axis. Some of the tubes have bolt shanks l3 welded thereto and the shanks pass with peripheral clearance through the openings 10 into the recesses 9 and are there engaged by locking nuts 14. Between each nut 14 and the bottom of the pertaining recess 9 are three washers, namely a fibrefrax washer 16 at the bottom of the recess and masking the opening 10, a 1% inch diameter stainless steel washer 17 next to the washer l6, and a inch diameter stainless steel washer 18 next to the washer 17. The tiles 5 have grooves 15 in their rear faces 11.

The throat is formed by locating in the duct therefor a backing of refractory cement. The tubes 12 are positioned with intermediate lengths thereof against the backing and with the bolts 13 extending in the direction of the duct interior. Further refractory cement is ap plied to completely embed the tubes and the tiles are applied against the further refractory cement with the grooves 15 assisting in keying the tiles in place.

The cement fixing the tiles in place is a refractory bedding cement and it will be manifest that refractory cemtnts of different characteristics are used at different parts of the construction. The tiles are of silicon carbide and, after the locking nuts 14 have been secured in place, the recesses 9 are filled with silicon carbide cement which is rammed into place until there is a finish flush with the front surfaces 6 of the tiles. Refractory caulking material is filled into the spaces and between adjacent tiles.

I claim:

1. A boiler having a flame-injection throat lined by shaped refractory tiles at least some of which have in their front faces recesses from which through-openings extend rearwardly, tubes disposed in banks at each of two opposed sides of said throat, said tubes being out of contact with one another at each said side of said throat and being at least substantially normal to the axis of said throat, bolts fast with at least some of said tubes, said bolts extending in the direction of said throat and the shanks thereof extending through said throughopenings, refractory cement fully embedding the tube lengths at said opposed sides of the throat and anchoring said tiles in place, locking nuts secured on the bolt shanks in said recesses and refractory cement flush filling said recesses.

2. A boiler as set forth in claim 1, in which adjacent tile edges are complementarily checked to interfit.

3. A method of forming a flame-injection throat of a boiler, comprising applying to a duct wherein the throat is to be located a backing of refractory cement, applying against the backing at each of two opposed regions of the duct intermediate lengths of circulation tubes disposed in a bank in non-contiguous relationship with their axes in planes at least substantially normal to the duct axis, at least some of said tubes having bolts welded thereto and extending towards the duct interior, applying further refractory cement to completely embed said intermediate lengths, applying against said further refractory cement tiles of refractory material shaped to fit together to define opposed regions of the throat, appropriate tiles having through openings for passage of said bolts and ending in recesses in the tile 4. A method as set forth in claim 3, in which the tile faces for location of bolt-engaging locking nuts, filling faces applied against said further refractory cement said recesses with refractory cement flush with the tile have therein grooves to assist keying of the tiles to said faces, and fitting shaped tiles of refractory cement to further refractory cement. complete the throat. 5 

1. A boiler having a flame-injection throat lined by shaped refractory tiles at least some of which have in their front faces recesses from which through-openings extend rearwardly, tubes disposed in banks at each of two opposed sides of said throat, said tubes being out of contact with one another at each said side of said throat and being at least substantially normal to the axis of said throat, bolts fast with at least some of said tubes, said bolts extending in the direction of said throat and the shanks thereof extending through said through-openings, refractory cement fully embedding the tube lengths at said opposed sides of the throat and anchoring said tiles in place, locking nuts secured on the bolt shanks in said recesses and refractory cement flush filling said recesses.
 2. A boiler as set forth in claim 1, in which adjacent tile edges are complementarily checked to interfit.
 3. A method of forming a flame-injection throat of a boiler, comprising applying to a duct wherein the throat is to be located a backing of refractory cement, applying against the backing at each of two opposed regions of the duct intermediate lengths of circulation tubes disposed in a bank in non-contiguous relationship with their axes in planes at least substantially normal to the duct axis, at least some of said tubes having boltS welded thereto and extending towards the duct interior, applying further refractory cement to completely embed said intermediate lengths, applying against said further refractory cement tiles of refractory material shaped to fit together to define opposed regions of the throat, appropriate tiles having through openings for passage of said bolts and ending in recesses in the tile faces for location of bolt-engaging locking nuts, filling said recesses with refractory cement flush with the tile faces, and fitting shaped tiles of refractory cement to complete the throat.
 4. A method as set forth in claim 3, in which the tile faces applied against said further refractory cement have therein grooves to assist keying of the tiles to said further refractory cement. 